Add way to enforce serial order in counter app from command line

cmd/counter/main.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"flag"
+
 	. "github.com/tendermint/go-common"
 	"github.com/tendermint/tmsp/example"
 	"github.com/tendermint/tmsp/server"
@@ -8,8 +10,12 @@ import (
 
 func main() {
 
+	serialPtr := flag.Bool("serial", false, "Enforce incrementing (serial) txs")
+	flag.Parse()
+	app := example.NewCounterApplication(*serialPtr)
+
 	// Start the listener
-	_, err := server.StartListener("tcp://0.0.0.0:46658", example.NewCounterApplication())
+	_, err := server.StartListener("tcp://0.0.0.0:46658", app)
 	if err != nil {
 		Exit(err.Error())
 	}

example/counter.go

@@ -13,10 +13,11 @@ type CounterApplication struct {
 	hashCount   int
 	txCount     int
 	commitCount int
+	serial      bool
 }
 
-func NewCounterApplication() *CounterApplication {
-	return &CounterApplication{}
+func NewCounterApplication(serial bool) *CounterApplication {
+	return &CounterApplication{serial: serial}
 }
 
 func (app *CounterApplication) Open() types.AppContext {
@@ -25,6 +26,7 @@ func (app *CounterApplication) Open() types.AppContext {
 		hashCount:   app.hashCount,
 		txCount:     app.txCount,
 		commitCount: app.commitCount,
+		serial:      app.serial,
 	}
 }